Transformers

nding of the principle of operation of a simple laminated iron-cored transformer and recall and solve problems using N1/N2V1/V2I2/I1 for an ideal transformer;
Describe the source of the changing magnetic flux in the core of a transformer based on Faradays law of induction.
Use the following equations in problem solving for an ideal transformer.

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Language objectives










Subject-specific vocabulary & terminology:
oo induction
oo alternating current
oo magnetic flux
oo magnetic flux linkage
oo rate of change
oo phase difference
oo secondary
oo primary
oo reactance
oo resistance


Useful sets of phrases for dialogue and writing:

A transformer changes an alternating p. d. to a different peak value using electromagnetic induction.
An alternating current flows through the primary coil, which produces an alternating magnetic field.
The field lines (magnetic flux) of the induced magnetic field then cut through the secondary coil, which induces an e. m. f.
Step-up transformers increase the voltage by having more turns on the secondary coil than on the primary coil.
Step-down transformers decrease the voltage by having more turns on the primary coil than on the secondary coil.

Values instilled at the lesson
Global Citizenship: When we interact with people from different cultures, we discover new ideas that force us to change our understanding of the world. Some of these ideas can face resistance due to our cultural differences. We understand and appreciate these ideas but keep our own ideas. Other ideas cause "embrace and store. These new ideas force us to change our understanding of so